"Manual configuration required" error in Simple Mode (Static Public IP, No CGNAT). Cannot use Router Mode.

Hi everyone,

I need urgent help. I cannot use Router Mode due to work requirements, so I must use Simple Mode.

I have verified my connection:

• I have a Static Public IP.

• I do NOT have CGNAT.

• I have opened UDP Port 51820 correctly.

The Problem: My Firewalla App is stuck showing the error "Manual configuration required" and the VPN (wiregyuard) will not connect.

The issue is that my router refuses to respect the IP settings. I have already tried ALL of this:

1. Static IP & MAC Binding attempt: My router's DHCP range ends at .199. I manually set the Firewalla to Static IP .203 (outside the range). I also configured the MAC Binding in the router to force the .203 IP.

   • Result: The router completely ignored the MAC Binding and the Static IP. It assigned a random IP anyway (skipping the .203), which immediately breaks the port forwarding rule.

2. DHCP attempt: I also tried the opposite: I set the Firewalla to standard DHCP to get an IP inside the router's range. That didn't work either.

3. Firewalla DHCP Mode: I tried disabling the router's DHCP server and using Firewalla's DHCP Mode. It failed.

4. DMZ: I tried putting the Firewalla in the DMZ. It failed.

5. ISP: My ISP confirmed the router is working fine on their end.

Whatever I do, the router keeps changing the IP or blocking the connection, and the "Manual configuration required" error persists.

Is there any solution for this?

Thanks.